Berlin, J. Springer, 1932-33. 8vo. Bound together in recent attractive marbled boards. Leather title-label with gilt lettering on front board. Title-pages from the three volumes withbound (small rubberstamp). (11),(9),(12) pp.
First edition of Heisenberg's neutron-proton model. Shortly after Chadwick discoverd the neutron in 1932, Heisenberg developed a theory suggesting that atomic nuclei are composed of protons and neutrons, -this introduced the concept of the nuclear exchange force and isotopic spin. (DSB 17: p.398).
Order-nr.: 26607